Instrument for drawing blood



July 4, 1939. G. .1. KADAVY INSTRUMENT FOR DRAWING BLOOD 9 7 5 wmulhfiflw l W m NH I 2 K 4 A -W Q... J 5 0 J 6 5 a i l M 1 y I w W 1 d u o6 Filed Jan. 50, 1939 fi A A i V/V/MW/AV Patented July 4, 1939 PATENTOFFICE INSTRUMENT FOR DRAWING BLOOD Godfrey J. Kad

avy, Omaha, Nebr.

Application January 30, 1939, Serial No. 253,689

1 Claim.

In drawing human blood for a blood test, resorting to an establishedcustom, a piece of rubber tubing is attached to a blood pipette, andmouth suction is applied to the rubber tubing, a custom having obviousdisadvantages. This invention aims to provide a simple means forsupplying mechanically produced suction, to draw blood, a novelmechanism being furnished for operating the pumping or suction means,said mechanism being capable of being actuated by the hand wherein thedevice is held.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the presentinvention appertains.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it

being understood that changes in the precise embodiment of the inventionherein disclosed, may be made within the scope of what is claimed,without departing from the spirit of the invention.

In the drawing:

Fig. 1 shows in side elevation, a device constructed in accordance withthe invention, parts being broken away;

Fig. 2 is a section on the line 22 of Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 2.

In carrying out the invention, there is provided a body B, which ispear-shaped, as shown in Fig. 2. The body B is reduced in thickness,somewhat, as disclosed in Fig. 1, so that it can be held readily in thehand of an operator. As

to shape, the body 13 includes a head I having a reduced neck 2. As tostructure, the body B includes a main member 3, having a recess 4,

0 adapted to receive a closure 5, the closure being held in place by acombined shaft and securing element 6, such as a screw. A chamber 1 isformed in the main member 3 and in the closure 5. There is, in the edgeof the head I, a slot 8,

communicating with the chamber 1, and disposed partly in the closure 5and partly in the main member 3. A cylinder 9 is formed in the neck 2.The neck 2 has a lateral extension I0, adapted to receive a rubberstopper I I, constituting means for holding a blood nozzle I2 incommunication with the cylinder t, the blood nozzle being the ordinarypipette.

A piston I4 is mounted for reciprocation in the cylinder 9, and issupplied at one end with a reduced fin I5, to one side of which ispivoted at It, a pitman II, the pitman being pivoted at I8 to a wheel I9mounted to turn on the shaft or screw 6. The wheel I9 is located, forthe most part, in the chamber I, but a small portion of the wheelprojects outwardly through the slot 8, the wheel I9 having a milledperiphery.

The operator takes the instrument in one hand, and that hand may be usedto turn the wheel I9, motion being transmitted to the piston I4 by wayof the pitman I1, and blood being drawn into and ejected from thecylinder 9, by way of the pipette I2.

The instrument is very simple in construction and in operation but isthoroughly effective for the ends in view. It is unnecessary to applysuction to the pipette I2 from the operators mouth. Since the instrumentis both held and operated by one hand, the other hand of the surgeon isleft free.

What is claimed is:

A device adapted to be used in such operations as drawing and deliveringblood for tests, comprising a body shaped to be held in one hand, thebody comprising suction and ejection means, and mechanism for actuatingthe suction and ejection means, said mechanism embodying a wheel mountedto rotate on the body and constituting the element to which operatingforce is applied initially, the wheel being of such diameter that it canbe housed partially within the body, the diameter of the wheel beingsuch, considered rela tively to the Width of the body, that the wheelwill be exposed outwardly of the body for actuation by the hand in whichthe body is held, and whilst said hand retains its hold upon the body.

GODFREY J. KADAVY.

